Ajout d'une fenêtre d'accueil
Modification de la class GuiMayorPro
Merge branch 'master' of https://github.com/ziellim/Mayor-Pro

Conflicts:
	application/src/main/scala/com/paris7/mayorpro/presentation/graphic/GuiMain.scala
Mise a jour de la class GuiMain
Merge branch 'master' of https://github.com/ziellim/Mayor-Pro

Conflicts:
	application/src/main/scala/com/paris7/mayorpro/presentation/graphic/MenuSimcity.scala